Balance.



No. 764,377. PATENTED JULY 5, 1904. P. G. RICHTER.

BALANCE.

APPLICATIQH FILED 1113.11, 1902.

UNITED STATES Patented July 5, 1904.

PATENT OFFIQlfi).

BALANCE.

SPECIFICATION forming part of Letters Patent No. 764,377, dated July 5,1904.

Application filed February 11. 1902. Serial No. 93,489. (No model.)

To all whom, if; may concern:

Be it known that I, PHILIPP GEORGE RICH- TER, a citizen of the UnitedStates, and a resident of the city of St. Louis, State of Missouri,

have invented a new and useful Improvement in Balances, of which thefollowing is a specification.

My invention relates to balances, and has for its principal objects todispense with jewels and knife-edges, to simplify and cheapen themanufacture, to secure a more rapid indication than is practicable withbalances commonly used, and to provideagainst wear.

My invention consists principally in the arrangement and combination ofparts hereinafter described and claimed.

In the accompanying drawings, which form part of this specification, andwherein like symbols refer to like parts wherever they occur, Figure 1is a plan view of my balance. Fig. 2 is a front elevation thereof. Fig.3 is avertical sectional detail on the line 3 3 of Fig. 1, showing themounting of the beam. Fig. 4 is an end view of the parts shown in Fig.3, the left branch of the yoke being shown in section.

My device comprises a base 1, upon which is fixed acolumn or uprighttube 2, on the top of which is fixed a yoke or U-shaped plate 3. The topof each leg of this yoke has grooves or sockets a therein to constitutebearings for two spindles 5, journaled horizontally therein. Each ofthese spindles has a wheel 6 fixed thereon near each end.

the length of their radius, each wheel is made with large segmentalopenings arranged symmetrically therein, so that each spindle may passthrough the openings in the wheels mounted on the other spindle.

Upon the top edges of the several wheels 6 rests a cylindrical spindle7, hereinafter called The wheels are all of equal size, and each wheelis so made that its The two the fulcrum-spindle. The wheels 6 thusconstitute a bearing for said fulcrum-spindle By reason of theoverlapping of adjacent wheels said spindle will slide down on theperiphery of one wheel until it bears against the periphery of the otherwheel and will then rest in contact with both wheels. In order toprevent the displacement of the fulcrum-spindle 7, grooves 8 are formedtherefor in the tops of the two legs of the yoke 3, said grooves beingwide enough to admit of slight lateral movements of the spindle and deepenough for the spindle to clear the bottoms thereof while resting uponthe bearing-wheels 6. In order to prevent cndwise displacement of theseveral spindles, end plates 9 are mounted on the yoke to cover the endsof the respective grooves, and in order to eliminate friction as far aspossible the ends of the several spindles are preferably pointed.

The fulcrum-spindle 7 has a balance-beam l0 fixed thereon, the portion11 of the spindle to which the beam is fixed being offset slightly, soas to lower the center of gravity of the beam. The beam 10 is ofsymmetrical shape and its geometrical center and center of gravitycoincide with its axis, which is below the point of support. The endportions 13 of the beam are formed into circular arcs, to the tops ofwhich are fastened cords 13, arranged to carry the scale-pans 14.. Thebeam is provided with a pointer 16, arranged to traverse a scale 17,mounted on the column 2, preferably near the bottom thereof. The top ofthe beam is also provided with a screw 18, upon which works a threadednut 19, which carries a winged nut or fiag 20, whereby a slightinaccuracy in the balance may be readily compensated for.

The principal advantages of my invention are the simplicity andcheapness of its manufacture, and the facility with which thebearing-surface may be changed before there is any appreciable wear, andthe strength of all parts in comparison with the corresponding parts ofother balances of the same sensitiveness, and the rapidity with which itindicates the true weight as compared with other balances of equalsensitiveness.

While the circular arcs at the ends of the beam involve a change of themoment-arm or leverage of a small portion of the cord and are andrequire the scale to be made empirically, this disadvantage is more thanoifset by the fact that the vertical movement of the weight does notinvolve any horizontal movement,and consequently the balance may beused'ifor special purposes where horizontal movement is not permissible.

What I claim is 1. A balance comprising a column having a yoke thereonand grooves in said yoke, two

spindle, and a beam having a spindle resting on said wheels,substantially as described.

3. A balance comprising two parallel spindles journaled horizontally andhaving overlapping wheels thereon, and a fulcrum-spindle resting on saidwheels and having an ofiset portion, and a beam mounted on said ofiisetportion, substantially as described.

4. A balance comprising a column having a yoke thereon and grooves insaid yoke, parallel spindles journaled horizontally in said grooves,overlapping wheels on said spindles, and a fulcrum-spindle'resting onsaid wheels and having an offset portion, and a beam mounted on saidoflset portion, substantially as described.

5. A balance comprising two parallel spindles journaled horizontally andhaving overlapping wheels thereon, said wheels having segmental-openings therein, and said spindles extending through said openings, afulcrumspindle resting on said wheels and a beam mounted on saidlast-mentioned spindle, substantially as described.

6. A balance comprising a column having a yoke thereon and grooves insaid yoke, two parallel spindles journaled in said grooves, two wheelsupon each of said spindles, the wheels upon one spindle overlapping thewheels upon the other spindle, a fulcrumspindle resting on said wheelsand having an offset portion and a beam mounted on said olfset portion,the said beam lying between the wheels upon either spindle.

St. Louis, Missouri, February 8, 1902.

PHILIPP GEORGE RICHTER.

In presence of" JAMES A. CARR, ZOLA TUCKER.

